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Specimen Collection Manual and Test Catalog

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C-PEPTIDE

Geisinger Epic Procedure Code:  LAB1903    Geisinger Epic ID:  21640

SPECIMEN COLLECTION
Specimen type: 

Serum


Preferred collection container: 
Specimen required: 

1 mL aliquot of serum; minimum 0.4 mL.


Special notes: 

Please submit a separate frozen aliquot for non-GMC sites. It may not be combined with any other test requiring a frozen aliquot.



SPECIMEN PROCESSING
Processing instructions: 

Allow to clot. Centrifuge at 1100-2000 g for a minimum of 10 minutes.


Transport temperature: 

Frozen.


Specimen stability: 

Room temperature: 4 hours. Refrigerated: 24 hours. Frozen: 30 days.


Rejection criteria: 

Specimens beyond stability limits.



TEST DETAILS
Reference interval: 

1.1-4.4 ng/mL (fasting)


CPT code(s):  84681
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.

Test includes: 

C-Peptide


Methodology: 
Electrochemiluminescence Immunoassay
Synonyms: 

CPEPG, Connecting peptide


Clinical significance: 

A nonreactive breakdown of insulin, it is used in the evaluation of pancreatic beta cell function in diabetes and for determining the source of insulin in patients with hyperinsulinemic hypoglycemia.


Doctoral Director(s): 
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM
Sheng-Ying (Margaret) Lo, PhD, DABCC
Review Date:  12/27/2024

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